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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
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Title 40
Chapter I
Part 1031
Subpart B - Subpart B—Emission Standards and Measurement Procedures
§ 1031.30 - Overview of emission standards and general requirements.
§ 1031.40 - Turboprop engines.
§ 1031.50 - Subsonic turbojet and turbofan engines at or below 26.7 kN thrust.
§ 1031.60 - Subsonic turbojet and turbofan engines above 26.7 kN thrust.
§ 1031.90 - Supersonic engines.
§ 1031.130 - Derivative engines for emissions certification purposes.
§ 1031.140 - Test procedures.
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